Operating Segment, Geographic Information and Significant Customers - Geographic Distribution of Revenues and Long Lived Assets from Continuing Operations (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 27, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 27, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			1
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 208,016	$ 174,636	$ 579,233	$ 477,781
Identifiable long-lived assets	78,664		78,664		$ 60,001
Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	56,786	52,372	170,586	133,686
Modules and Sub-assemblies
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	46,069	36,153	148,583	130,142
Integrated Subsystems
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	105,161	86,111	260,064	213,953
Total Sensor & Effector
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	144,612	105,607	357,457	273,458
Radar
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	78,113	40,674	164,360	123,661
Electronic Warfare
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	40,221	36,569	112,417	86,320
Other Sensor & Effector
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	26,278	28,364	80,680	63,477
C4I
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	47,351	46,217	154,140	137,717
Other End Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	16,053	22,812	67,636	66,606
Domestic
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	187,560	153,634	516,659	427,119
International/Foreign Military Sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	20,456	21,002	62,574	50,662
US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	196,158	158,715	539,535	435,733
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	11,408	15,280	37,569	39,918
Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	450	641	2,129	2,130
Reportable Geographical Components | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	196,547	161,699	541,550	441,167
Identifiable long-lived assets	73,549		73,549		54,952
Reportable Geographical Components | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	12,162	15,594	39,791	40,935
Identifiable long-lived assets	5,108		5,108		5,037
Reportable Geographical Components | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	450	641	2,129	2,130
Identifiable long-lived assets	7		7		12
Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	(1,143)	(3,298)	(4,237)	(6,451)
Identifiable long-lived assets	0		0		$ 0
Geography Eliminations | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	389	2,984	2,015	5,434
Geography Eliminations | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	754	314	2,222	1,017
Geography Eliminations | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 0	$ 0	$ 0	$ 0